Jeah adrien moreau



1. A. MOREAU.

SPARK PLUG.

APPLICATION mzo v4.2a. 1919.

1 ,306', 27 1 Patented June 10, i919.

Ewen/Z277 JEAN ADRIEN MOREAU, OF PARIS, FRANCE.

SPARK-PLUG.

Application filed January 28, 1919.

T 0 all whom it may concern:

Be it known that I, J EAN ADRiEN MOREAU, citizen of the Republic of France, and resident of 96 Boulevard Preire, Paris, in the said Republic, have invented a new and useful Improvement in Sparl -Plugs, of which the following is a specification.

This invention relates to spark plugs and consists in an improved spark plug which is distinguished by the following features:

1. Cooling of the central electrode and of the whole plug is automatically produced by means of a heat conducting metal body, the cooling surfaces of which have been increased in the largest possible measure, while the body of insulating material, which is a heat collector has been reduced to a minimum.

2. Every joint is dispensed with owing to a connection by means of a metal conical shoulder; as the plug, when put together is substantially a single piece, every danger of leakage is avoided.

3. Thehighest degree of cooling is produced at points where the heat would reach its highest value.

4- A sufficient and well protected electrical insulation by means of mica is obtained with an economy of material, the quantity of mica employed being very small.

5. "The electrodes can be taken out and cleaned instantaneously without using any special tools and without lessening the tightness of the joint, even after the plug has been taken apart and put together again a number oftimes.

6. Any expansion (such as the lengthening of the electrode rod at high temperatures) is made up for by expansion (lengthening) of a metal sheath which acts as a stay between the two groups of mica washers. Therefore the homogeneity and compression of the mica remain constant.

A spark plug constructed according to the present system is illustrated by Figure 1 of the annexed drawing, Fig. 2 being a longitudinal sectional view of same.

The mode of construction of the improved spark plug is as follows:

The plug consists of a metal body 1 made on a cutting lathe, a threaded part 1 designed to be screwed in the cylinder, a six-sided nut l and a perforated tubular part 1, all of these parts being of steel or other metal, a spring 1 and an independent washer 14.-

Specification of Letters Patent.

Patented June 10, 1919.

Serial No. 273.577.

Said metal body 1 is centrally bored and is provided with a seat 2 the surface of which is at an angle of 15 and with a groove 3 designed to reduce the clogging and situated in the rear of the threaded part 1.

A central electrode rod 1 of nickel-steel is provided at its extremity with a head. A small plate of pure nickel 5 constitutes the electrode points. The head presses the mica washers 6 against a tube 8 which surrounds and supports the mica tube 7.

Said tube 8 is of steel or other metal for the greater part a b of its length, while its upper end 8 is formed by mica washers.

A nut 9 bears by means of a washer 10 against the end of tube 8, 8'; when tightened, this nut is given a cylindrical shape in order to permit it to enter with the latter into the metal body 1 or rather into a tubular extension of same, made of fibrous ma terial. At the same time said tube 8, 8 is given the same diameter as the internal diameter of the metal body 1, and the conical shoulder at an angle of 45 which is to bear upon seat 2 is formed thereon.

The parts thus constructed having been introduced as a whole in the metal body 1, with the conical shoulder adjusted upon its seat 2, they are tightened and secured in position by means of the six-faced nut 12, placed upon the independent washer 13 which itself bears against the tube 11 of fibrous material, the latter resting upon the metal body 1 and upon the washer 141 compressing spring 1 The cone is previously ground upon, its seat 2. The spring 1 is guided by the tubular part 1 of the metallic body 1.

When desired, spring 1 may be dispensed with; in that case the part 1 is made thicker. It is preferable however to use a spring as a part of the metallic body, because besides a cooling action it insures the permanent tightness of the joints by compensating any expansion or contraction of the parts of the plug.

Having thus described my invention and the best means I know of carrying the same into practical effect, I claim 1. A spark plug comprising: an electrode rod; a head at one end ofthis rod; a thread on the other extremity of. the latter a tube made of insulating material around the said electrode; a metal tube surrounding the said insulating tube a; conical shoulder formed on said metal tube; an insulating lining at each end of the latter; an external tubular metallic body secured to the engines cylinder; a conical seat formed inside said body; a nut pressing both the insulating tube and the internal metallic tube with its linings against the head of the electrode rod; and a second nut drawing the conical shoulder formed on the internal metallic tube against the seat on the external metal body.

2. A spark plug comprising: an electrode rod; a head at one end of this rod; a thread on the other extremity of the latter; a tube made of insulating material around the said electrode; a metal tube surrounding the said insulating tube; a conical shoulder formed .on said metal tube; an insulating lining at each end of the latter; an external tubular metallic body secured to the engines cylinand a second nut drawing the conical shoul-V der formed on the internal metallic tube against the seat on the external metal body.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this seventh day of January, 1919.

JEAN ADRIEN MOREAU.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

